docs/design: template (#1911)

docs/design/TEMPLATE.md

@@ -0,0 +1,28 @@
+[This is a template for Storj v3 design docs]
+
+# Title: [Title]
+
+## Abstract
+
+[A short summary of what this design doc accomplishes at a high level.]
+
+## Background
+
+[An introduction of the necessary background and the problem being solved.]
+
+## Design
+
+[A precise statement of the design and its constituent subparts.]
+
+## Rationale
+
+[A discussion of alternate approaches and the trade offs, advantages, and disadvantages of the specified approach.]
+
+## Implementation
+
+[A description of the steps in the implementation.]
+
+## Open issues (if applicable)
+
+[A discussion of issues relating to this proposal for which the author does not
+know the solution. This section may be omitted if there are none.]